That "Service Mode" just cycles through the 3 primary colors with a few test patterns. There are no adjustments in there. Maybe there is a more comprehensive service menu hidden in there, but that is not it.
The projector is controllable via the serial port and somebody posted the protocol for controlling it. While the panasonic document that discussed the protocol was limited to commands that control user functions that are available via the remote control, no doubt the service menu options are accessed in the same fashion. What we need is to get a couple of these things to some bored 15 year olds, and they'll hack it! :D